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Scala program to iterate map using the for loop

Here, we are going to learn how to iterate map using the for loop in Scala programming language?
Submitted by Nidhi, on June 10, 2021 [Last updated : March 11, 2023]

Scala - Iterating Map (Using For Loop)

Here, we will create two maps using Map collection. The Map collection is used to store key/value pairs and then iterate the map using the for loop and print on the console screen.

Scala code to iterate map using for loop

The source code to iterate map using the for loop is given below. The given program is compiled and executed on the ubuntu 18.04 operating system successfully.

// Scala program to print iterate map using "for" loop

object Sample {
  // Main method
  def main(args: Array[String]) {
    var students = Map(("101", "Amit"), ("102", "Arun"), ("103", "Anit"))
    var employees = Map((1001, "Akash"), (1002, "Vikas"), (1003, "Prakash"))

    println("Student Information:");
    for ((stuId, stuName) <- students)
      printf("\tId: %s, Name: %s\n", stuId, stuName);

    println("Employee Information:");
    for ((empId, empName) <- employees)
      printf("\tId: %d, Name: %s\n", empId, empName);
  }
}

Output

Student Information:
	Id: 101, Name: Amit
	Id: 102, Name: Arun
	Id: 103, Name: Anit
Employee Information:
	Id: 1001, Name: Akash
	Id: 1002, Name: Vikas
	Id: 1003, Name: Prakash

Explanation

Here, we used an object-oriented approach to create the program. And, we also created a singleton object Sample and defined the main() function. The main() function is the entry point for the program.

In the main() function, we created two maps students and employees. The students map contains the student id and student name. The employees map contains employee id and employee name. Then we iterated created maps using the for loop and printed the result on the console screen.

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